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2007-02-12[PATCH] S3C2410 GPIO wrappersPhilipp Zabel
Arch-neutral GPIO calls for S3C24xx. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12[PATCH] SA1100 GPIO wrappersPhilipp Zabel
Arch-neutral GPIO calls for SA-1100. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12[PATCH] PXA GPIO wrappersPhilipp Zabel
Arch-neutral GPIO calls for PXA. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12[PATCH] AT91 GPIO wrappersDavid Brownell
This is a first cut at making the AT91 code use the generic GPIO calls. Note that the original AT91 GPIO calls merged the "mux pin as GPIO" and "set GPIO direction" functionality into one API call, contrary to what's specified as a cross-platform portable model. So this involved a few non-inlinable functions. [akpm@osdl.org: cleanups] Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12[PATCH] OMAP GPIO wrappersDavid Brownell
This teaches OMAP how to implement the cross-platform GPIO interfaces. [akpm@osdl.org: cleanups] Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12[PATCH] GPIO coreDavid Brownell
This defines a simple and minimalist programming interface for GPIO APIs: - Documentation/gpio.txt ... describes things (read it) - include/asm-arm/gpio.h ... defines the ARM hook, which just punts to <asm/arch/gpio.h> for any implementation - include/asm-generic/gpio.h ... implement "can sleep" variants as calling the normal ones, for systems that don't handle i2c expanders. The immediate need for such a cross-architecture API convention is to support drivers that work the same on AT91 ARM and AVR32 AP7000 chips, which embed many of the same controllers but have different CPUs. However, several other users have been reported, including a driver for a hardware watchdog chip and some handhelds.org multi-CPU button drivers. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12[PATCH] SPI: Freescale iMX SPI controller driver (BIS+)Andrea Paterniani
Add the SPI controller driver for Freescale i.MX(S/L/1). Main features summary: > Per chip setup via board specific code and/or protocol driver. > Per transfer setup. > PIO transfers. > DMA transfers. > Managing of NULL tx / rx buffer for rd only / wr only transfers. This patch replace patch-2.6.20-rc4-spi_imx with the following changes: > Few cosmetic changes. > Function map_dma_buffers now return 0 for success and -1 for failure. > Solved a bug inside spi_imx_probe function (wrong error path). > Solved a bug inside setup function (bad undo setup for max_speed_hz). > For read-only transfers, always write zero bytes. This is almost the same as the 'BIS' version sent by Andrea, except for updating the 'DUMMY' byte so that read-only transfers shift out zeroes. That part of the API changed recently, since some half duplex peripheral chips require that semantic. Signed-off-by: Andrea Paterniani <a.paterniani@swapp-eng.it> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: Input: remove scan_keyb driver Input: i8042 - fix AUX IRQ delivery check Input: wistron - add support for Fujitsu-Siemens Amilo D88x0 Input: inport - use correct config option for ATIXL Input: HIL - handle erros from input_register_device() Input: tsdev - schedule removal Input: add Atlas button driver Input: ads7846 - be more compatible with the hwmon framework Input: ads7846 - detect pen up from GPIO state Input: ads7846 - select correct SPI mode Input: ads7846 - switch to using hrtimer Input: ads7846 - optionally leave Vref on during differential measurements Input: ads7846 - pluggable filtering logic Input: gpio-keys - keyboard driver for GPIO buttons Input: hid-ff - add support for Logitech Momo racing wheel Input: i8042 - really suppress ACK/NAK during panic blink Input: pc110pad - return proper error
2007-02-11[PATCH] Remove the last reference to rwlock_is_locked() macro.Robert P. J. Day
Remove the lone, remaining reference to the long-deceased rwlock_is_locked() macro. Signed-off-by: Robert P. J. Day <rpjday@mindspring.com> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] fix sparse warnings from {asm,net}/checksum.hTilman Schmidt
Rename the variable "sum" in the __range_ok macros to avoid name collisions causing lots of "symbol shadows an earlier one" warnings by sparse. Signed-off-by: Tilman Schmidt <tilman@imap.cc> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Andi Kleen <ak@suse.de> Cc: Hirokazu Takata <takata@linux-m32r.org> Acked-by: Ian Molton <spyro@f2s.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11[PATCH] consolidate line discipline number definitionsTilman Schmidt
The line discipline numbers N_* are currently defined for each architecture individually, but (except for a seeming mistake) identically, in asm/termios.h. There is no obvious reason why these numbers should be architecture specific, nor any apparent relationship with the termios structure. The total number of these, NR_LDISCS, is defined in linux/tty.h anyway. So I propose the following patch which moves the definitions of the individual line disciplines to linux/tty.h too. Three of these numbers (N_MASC, N_PROFIBUS_FDL, and N_SMSBLOCK) are unused in the current kernel, but the patch still keeps the complete set in case there are plans to use them yet. Signed-off-by: Tilman Schmidt <tilman@imap.cc> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-10Merge rsync://rsync.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6Dmitry Torokhov
2007-02-09Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-apmLinus Torvalds
* 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-apm: [APM] SH: Convert to use shared APM emulation. [APM] MIPS: Convert to use shared APM emulation. [APM] ARM: Convert to use shared APM emulation. [APM] Add shared version of APM emulation
2007-02-09[PATCH] kill eth_io_copy_and_sum()Al Viro
On all targets that sucker boils down to memcpy_fromio(sbk->data, from, len). The function name is highly misguiding (it _never_ does any checksums), the last argument is just a noise and simply expanding the call to memcpy_fromio() gives shorter and more readable source. For a lot of reasons it has almost no remaining users, so it's better to just outright kill it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-09[APM] ARM: Convert to use shared APM emulation.Ralf Baechle
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-01-25[ARM] 4111/1: Allow VFP to work with thread migration on SMPCatalin Marinas
The current lazy saving of the VFP registers is no longer possible with thread migration on SMP. This patch implements a per-CPU vfp-state pointer and the saving of the VFP registers at every context switch. The registers restoring is still performed in a lazy way. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-01-24[ARM] 4106/1: S3C2410: typo fixes in register definitionsMatt Reimer
The Trcd* bits of the S3C24xx BANKCON6 and BANKCON7 registers are misspelled in include/asm-arm/arch-s3c2410/regs-mem.h as Trdc*. Signed-off-by: Matt Reimer <mreimer@vpop.net> Acked-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-01-24[ARM] 4095/1: S3C24XX: Fix GPIO set for Bank ABen Dooks
GPIO bank A can only be output or a special function, and the regs-gpio.h header has mistakenly got this as input or output. The mistake is carried on into the gpio.c s3c2410_gpio_cfgpin() call which will set the wrong value if S3C2410_GPIO_OUTPUT is passed. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-01-24[ARM] 4086/1: AT91: Whitespace cleanupAndrew Victor
A couple of whitespace cleanups, mainly in the AT91 header files. Signed-off-by: Andrew Victor <andrew@sanpeople.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-01-24[ARM] 4085/1: AT91: Header fixes.Andrew Victor
Fix two typo's where AT01_* was used instead of AT91_*. [Patch from Wojtek Kaniewski] Fix definition of AT91_SMC_EXNWMODE for the SAM9 processors. [Patch from Wu Xuan] Signed-off-by: Andrew Victor <andrew@sanpeople.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-01-18Input: gpio-keys - keyboard driver for GPIO buttonsPhil Blundell
This is an interrupt-driven keyboard driver for simple buttons connected directly to CPU GPIO lines of embedded ARM systems. It supports pxa architectures and is used by a number of PDAs and PocketPC phones in the handhelds.org kernel. Support for other architectures, such as sa11xx and sc2410, will be added once generic GPIO API is available. Signed-off-by: Paul Sokolovsky <pmiscml@gmail.com> Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2007-01-08[ARM] Resolve fuse and direct-IO failures due to missing cache flushesRussell King
fuse does not work on ARM due to cache incoherency issues - fuse wants to use get_user_pages() to copy data from the current process into kernel space. However, since this accesses userspace via the kernel mapping, the kernel mapping can be out of date wrt data written to userspace. This can lead to unpredictable behaviour (in the case of fuse) or data corruption for direct-IO. This resolves debian bug #402876 Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-01-06[ARM] 4082/1: iop3xx: fix iop33x gpio register offsetDan Williams
iop33x gpio offset is correct in include/asm-arm/arch-iop33x/iop33x.h, but include/asm-arm/hardware/iop3xx.h adds 4. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-01-02[ARM] 4081/1: Add definition for TI Sync Serial ProtocolPhilipp Zabel
Of the possible SSP frame formats (FRF bits in SSCR0), only SSCR0_PSP is defined. Other possible formats are Motorola SPI (0<<4), TI SSP (1<<4) and Microwire (2<<4). Attached patch adds a definition SSCR0_TISSP. This mode is used for the sound codec attached to the PXA272 SSP1 of some HTC PDA phones. Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-01-02[ARM] 4080/1: Fix for the SSCR0_SlotsPerFrm macroPhilipp Zabel
The SSCR0_SlotsPerFrm macro writes a 3-bit value to bits [2:0], while the correct location of FRDC in SSCR0 is at bits [26:24]. This patch adds the missing "<< 24". Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-12-30[ARM] 4078/1: Fix ARM copypage cache coherency problemsRichard Purdie
If PG_dcache_dirty is set for a page, we need to flush the source page before performing any copypage operation using a different virtual address. This fixes the copypage implementations for XScale, StrongARM and ARMv6. This patch fixes segmentation faults seen in the dynamic linker under the usage patterns in glibc 2.4/2.5. Signed-off-by: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-12-30[ARM] 4077/1: iop13xx: fix __io() macroDan Williams
Since iop13xx defines the PCI I/O spaces with physical resource addresses the __io macro needs to perform the physical to virtual conversion. I incorrectly assumed that this would be handled by ioremap, but drivers (like e1000) directly dereference the address returned from __io. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-12-30[ARM] 4074/1: Flat loader stack alignmentPaul Brook
The ARM EABI requires doubleword (8-byte) stack alignment at all public entry points. The patch below makes the bFLT loader honour this. It's always safe to start with a doubleword aligned stack so it doesn't seem worth making this conditional on CONFIG_AEABI. Paul Signed-off-by: Paul Brook <paul@codesourcery.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-12-30[ARM] 4073/1: Prevent s3c24xx drivers from including asm/arch/hardware.h and ↵Arnaud Patard
asm/arch/irqs.h As reminded in http://lkml.org/lkml/2006/12/23/26, one should use asm/hardware.h and asm/irq.h but absent-minded devs like me tends to use asm/arch/hardware.h and/or asm/arch/irqs.h. This patch aims at preventing such things. In order to make it work, I had to modify asm-arm/irq.h too so that it can be included from assembly files. Also, as a side effect, I had to modify some headers who were using the asm/arch/hardware.h or asm/arch/irqs.h. Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-12-30[ARM] 4063/1: ep93xx: fix IRQ_EP93XX_GPIO?MUX numberingLennert Buytenhek
Fix incorrect IRQ numbering in arch-ep93xx/irqs.h (source: Applied Data Systems 2.6.17 kernel tree.) Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-12-18[ARM] 4057/1: ixp23xx: unconditionally enable hardware coherencyLennert Buytenhek
On ixp23xx, it was thought to be necessary to disable coherency to work around certain silicon errata. This turns out not to be the case -- none of the documented errata workarounds require disabling coherency, and disabling coherency does not work around any existing errata. Furthermore, all ixp23xx models do support coherency, so we should just unconditionally enable coherency for all ixp23xx. Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-12-18[ARM] 4055/1: iop13xx: fix phys_io/io_pg_offst for iq81340mc/scLennert Buytenhek
The phys_io/io_pg_offst machine record variables were being set to bogus values, causing problems when enabling DEBUG_LL. Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-12-18[ARM] 4054/1: ep93xx: add HWCAP_CRUNCHLennert Buytenhek
Add HWCAP_CRUNCH so that the dynamic linker knows whether it can use Crunch-optimised libraries or not. Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-12-18[ARM] Fix warnings from asm/system.hRussell King
Move adjust_cr() into arch/arm/mm/mmu.c, and move irqflags.h to a more appropriate place in the header file. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-12-17[ARM] 4049/1: S3C24XX: fix sparse warning due to upf_t in regs-serial.hBen Dooks
Change the include/asm-arm/arch-s3c2410/regs-serial.h platform data to use the prorper type (upf_t) for the uart_flags. Fix all the other parts of arch/arm/mach-s3c2410 to include <linux/serial_core.h> and all other uses of the include file. mach-rx3715.c:101:18: warning: incorrect type in initializer (different base types) mach-rx3715.c:101:18: expected unsigned long [unsigned] uart_flags mach-rx3715.c:101:18: got restricted unsigned int [usertype] [force] <noident> Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-12-17[ARM] 4045/1: S3C24XX: remove old VA for non-shared areasBen Dooks
Remove old (and non-shared) VA addresses from the mappings in arch/arm/mach-s3c2410/map.h and anywhere they are being mapped in arch/arm/mach-s3c2410 Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-12-17[ARM] 4042/1: H1940: Fix sparse errors from VA addressesBen Dooks
Fix address-space conversion errors from passing addresses generated from include/asm-arm/arch-s3c2410/map.h by adding an __force argument to the `void __iomem *` for all the virtual addresses. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-12-17[ARM] 4041/1: S3C24XX: Fix sparse errors from VA addressesBen Dooks
Fix address-space conversion errors from passing addresses generated from include/asm-arm/arch-s3c2410/map.h by adding an __force argument to the `void __iomem *` for all the virtual addresses. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-12-17[ARM] 4039/1: S3C24XX: Fix copyrights in include/asm-arm/arch-s3c2410 (mach)Ben Dooks
Fix copyright notices in include/asm-arm/arch-s3c2410 to actually have `Copyright` in the line. This patch deals with all the core files. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-12-17[ARM] 4038/1: S3C24XX: Fix copyrights in include/asm-arm/arch-s3c2410 (core)Ben Dooks
Fix copyright notices in include/asm-arm/arch-s3c2410 to actually have `Copyright` in the line. This patch deals with all the core files. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-12-17[ARM] Add more syscallsRussell King
Add: sys_unshare sys_set_robust_list sys_get_robust_list sys_splice sys_arm_sync_file_range sys_tee sys_vmsplice sys_move_pages sys_getcpu Special note about sys_arm_sync_file_range(), which is implemented as: asmlinkage long sys_arm_sync_file_range(int fd, unsigned int flags, loff_t offset, loff_t nbytes) { return sys_sync_file_range(fd, offset, nbytes, flags); } We can't export sys_sync_file_range() directly on ARM because the argument list someone picked does not fit in the available registers. Would be nice if... there was an arch maintainer review mechanism for new syscalls before they hit the kernel. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-12-13Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds
* 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm: [ARM] 4017/1: [Jornada7xx] - Updating Jornada720.c [ARM] 3992/1: i.MX/MX1 CPU Frequency scaling support [ARM] Provide a method to alter the control register [ARM] 4016/1: prefetch macro is wrong wrt gcc's "delete-null-pointer-checks" [ARM] Remove empty fixup function [ARM] 4014/1: include drivers/hid/Kconfig [ARM] 4013/1: clocksource driver for netx [ARM] 4012/1: Clocksource for pxa [ARM] Clean up ioremap code [ARM] Unuse another Linux PTE bit [ARM] Clean up KERNEL_RAM_ADDR [ARM] Add sys_*at syscalls [ARM] 4004/1: S3C24XX: UDC remove implict addition of VA to regs [ARM] Formalise the ARMv6 processor name string [ARM] Handle HWCAP_VFP in VFP support code [ARM] 4011/1: AT91SAM9260: Fix compilation with NAND driver [ARM] 4010/1: AT91SAM9260-EK board: Prepare for MACB Ethernet support
2006-12-13[ARM] Merge AT91 and devel branchesRussell King
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-12-13[ARM] 3992/1: i.MX/MX1 CPU Frequency scaling supportPavel Pisa
Support to change MX1 CPU frequency at runtime. Tested on PiKRON's PiMX1 board and seems to be fully stable up to 200 MHz end even as low as 8 MHz. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-12-13[ARM] Provide a method to alter the control registerRussell King
i.MX needs to tweak the control register to support CPU frequency scaling. Rather than have folk blindly try and change the control register by writing to it and then wondering why it doesn't work, provide a method (which is safe for UP only, and therefore only available for UP) to achieve this. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-12-13[ARM] 4016/1: prefetch macro is wrong wrt gcc's "delete-null-pointer-checks"Nicolas Pitre
optimization The gcc manual says: |`-fdelete-null-pointer-checks' | Use global dataflow analysis to identify and eliminate useless | checks for null pointers. The compiler assumes that dereferencing | a null pointer would have halted the program. If a pointer is | checked after it has already been dereferenced, it cannot be null. | Enabled at levels `-O2', `-O3', `-Os'. Now the problem can be seen with this test case: #include <linux/prefetch.h> extern void bar(char *x); void foo(char *x) { prefetch(x); if (x) bar(x); } Because the constraint to the inline asm used in the prefetch() macro is a memory operand, gcc assumes that the asm code does dereference the pointer and the delete-null-pointer-checks optimization kicks in. Inspection of generated assembly for the above example shows that bar() is indeed called unconditionally without any test on the value of x. Of course in the prefetch case there is no real dereference and it cannot be assumed that a null pointer would have been caught at that point. This causes kernel oopses with constructs like hlist_for_each_entry() where the list's 'next' content is prefetched before the pointer is tested against NULL, and only when gcc feels like applying this optimization which doesn't happen all the time with more complex code. It appears that the way to prevent delete-null-pointer-checks optimization to occur in this case is to make prefetch() into a static inline function instead of a macro. At least this is what is done on x86_64 where a similar inline asm memory operand is used (I presume they would have seen the same problem if it didn't work) and resulting code for the above example confirms that. An alternative would consist of replacing the memory operand by a register operand containing the pointer, and use the addressing mode explicitly in the asm template. But that would be less optimal than an offsettable memory reference. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-12-13[PATCH] Optimize D-cache alias handling on forkRalf Baechle
Virtually index, physically tagged cache architectures can get away without cache flushing when forking. This patch adds a new cache flushing function flush_cache_dup_mm(struct mm_struct *) which for the moment I've implemented to do the same thing on all architectures except on MIPS where it's a no-op. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-13[PATCH] PM: Fix SMP races in the freezerRafael J. Wysocki
Currently, to tell a task that it should go to the refrigerator, we set the PF_FREEZE flag for it and send a fake signal to it. Unfortunately there are two SMP-related problems with this approach. First, a task running on another CPU may be updating its flags while the freezer attempts to set PF_FREEZE for it and this may leave the task's flags in an inconsistent state. Second, there is a potential race between freeze_process() and refrigerator() in which freeze_process() running on one CPU is reading a task's PF_FREEZE flag while refrigerator() running on another CPU has just set PF_FROZEN for the same task and attempts to reset PF_FREEZE for it. If the refrigerator wins the race, freeze_process() will state that PF_FREEZE hasn't been set for the task and will set it unnecessarily, so the task will go to the refrigerator once again after it's been thawed. To solve first of these problems we need to stop using PF_FREEZE to tell tasks that they should go to the refrigerator. Instead, we can introduce a special TIF_*** flag and use it for this purpose, since it is allowed to change the other tasks' TIF_*** flags and there are special calls for it. To avoid the freeze_process()-refrigerator() race we can make freeze_process() to always check the task's PF_FROZEN flag after it's read its "freeze" flag. We should also make sure that refrigerator() will always reset the task's "freeze" flag after it's set PF_FROZEN for it. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Cc: Russell King <rmk@arm.linux.org.uk> Cc: David Howells <dhowells@redhat.com> Cc: Andi Kleen <ak@muc.de> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-13[ARM] Unuse another Linux PTE bitRussell King
L_PTE_ASID is not really required to be stored in every PTE, since we can identify it via the address passed to set_pte_at(). So, create set_pte_ext() which takes the address of the PTE to set, the Linux PTE value, and the additional CPU PTE bits which aren't encoded in the Linux PTE value. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-12-12Merge branch 'i2c-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6Linus Torvalds
* 'i2c-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6: i2c: Fix OMAP clock prescaler to match the comment i2c: Refactor a kfree in i2c-dev i2c: Fix return value check in i2c-dev i2c: Enable PEC on more i2c-i801 devices i2c: Discard the i2c algo del_bus wrappers i2c: New ARM Versatile/Realview bus driver i2c: fix broken ds1337 initialization i2c: i2c-i801 documentation update i2c: Use the __ATTR macro where possible i2c: Whitespace cleanups i2c: Use put_user instead of copy_to_user where possible i2c: New Atmel AT91 bus driver i2c: Add support for nested i2c bus locking i2c: Cleanups to the i2c-nforce2 bus driver i2c: Add request/release_mem_region to i2c-ibm_iic bus driver i2c: New Philips PNX bus driver i2c: Delete the broken i2c-ite bus driver i2c: Update the list of driver IDs i2c: Fix documentation typos